linux-kernel - Re: [PATCH v3 0/5] [SCSI] ufshcd: UFS Host Controller Driver

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Date:	Thu, 22 Mar 2012 13:51:51 +0000
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Santosh Y <santoshsy@...il.com>
Cc:	linux-scsi@...r.kernel.org, patches@...aro.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	arnd.bergmann@...aro.org, saugata.das@...aro.org,
	dsaxena@...aro.org, stephen.doel@...aro.org, venkat@...aro.org,
	ilho215.lee@...sung.com, nala.la@...sung.com,
	girish.shivananjappa@...aro.org, vishak.g@...sung.com,
	k.rajesh@...sung.com, yejin.moon@...sung.com,
	sreekumar.c@...sung.com, vinholikatti@...il.com,
	linkinjeon@...il.com, michaelc@...wisc.edu
Subject: Re: [PATCH v3 0/5] [SCSI] ufshcd: UFS Host Controller Driver

On Wed, 2012-02-29 at 12:11 +0530, Santosh Y wrote:
> From: Santosh Yaraganavi <santoshsy@...il.com>
> 
> UFS:
> Universal Flash Storage is a storage specification for flash devices.
> It is aimed to provide a universal storage interface for both
> embedded and removable flash memory based storage in mobile
> devices such as smart phones and tablet computers. The specification
> is defined by JEDEC Solid State Technology Association. UFS is based
> on MIPI M-PHY physical layer standard. UFS uses MIPI M-PHY as the
> physical layer and MIPI Unipro as the link layer.

This doesn't compile correctly on a 32 bit platform:

  CC [M]  drivers/scsi/ufs/ufshcd.o
drivers/scsi/ufs/ufshcd.c: In function ‘ufshcd_map_sg’:
drivers/scsi/ufs/ufshcd.c:555:5: warning: right shift count >= width of
type [enabled by default]
drivers/scsi/ufs/ufshcd.c: In function ‘ufshcd_host_memory_configure’:
drivers/scsi/ufs/ufshcd.c:831:5: warning: right shift count >= width of
type [enabled by default]
drivers/scsi/ufs/ufshcd.c: In function ‘ufshcd_initialize_hba’:
drivers/scsi/ufs/ufshcd.c:1037:2: warning: right shift count >= width of
type [enabled by default]
drivers/scsi/ufs/ufshcd.c:1041:2: warning: right shift count >= width of
type [enabled by default]

That's because you use >> 32 for the upper address bits.

I did the replacement below to use macros which do this correctly
(basically trick the compiler).

James

---

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 07ec973..52b96e8 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -550,9 +550,9 @@ static int ufshcd_map_sg(struct ufshcd_lrb *lrbp)
 			prd_table[i].size  =
 				cpu_to_le32(((u32) sg_dma_len(sg))-1);
 			prd_table[i].base_addr =
-				cpu_to_le32(sg->dma_address);
+				cpu_to_le32(lower_32_bits(sg->dma_address));
 			prd_table[i].upper_addr =
-				cpu_to_le32((sg->dma_address >> 32));
+				cpu_to_le32(upper_32_bits(sg->dma_address));
 		}
 	} else {
 		lrbp->utr_descriptor_ptr->prd_table_length = 0;
@@ -826,9 +826,9 @@ static void ufshcd_host_memory_configure(struct ufs_hba *hba)
 		cmd_desc_element_addr =
 				(cmd_desc_dma_addr + (cmd_desc_size * i));
 		utrdlp[i].command_desc_base_addr_lo =
-				cpu_to_le32(cmd_desc_element_addr);
+				cpu_to_le32(lower_32_bits(cmd_desc_element_addr));
 		utrdlp[i].command_desc_base_addr_hi =
-				cpu_to_le32(cmd_desc_element_addr >> 32);
+				cpu_to_le32(upper_32_bits(cmd_desc_element_addr));
 
 		/* Response upiu and prdt offset should be in double words */
 		utrdlp[i].response_upiu_offset =
@@ -1034,11 +1034,11 @@ static int ufshcd_initialize_hba(struct ufs_hba *hba)
 	/* Configure UTRL and UTMRL base address registers */
 	writel(hba->utrdl_dma_addr,
 	       (hba->mmio_base + REG_UTP_TRANSFER_REQ_LIST_BASE_L));
-	writel((hba->utrdl_dma_addr >> 32),
+	writel(lower_32_bits(hba->utrdl_dma_addr),
 	       (hba->mmio_base + REG_UTP_TRANSFER_REQ_LIST_BASE_H));
 	writel(hba->utmrdl_dma_addr,
 	       (hba->mmio_base + REG_UTP_TASK_REQ_LIST_BASE_L));
-	writel((hba->utmrdl_dma_addr >> 32),
+	writel(upper_32_bits(hba->utmrdl_dma_addr),
 	       (hba->mmio_base + REG_UTP_TASK_REQ_LIST_BASE_H));
 
 	/* Initialize unipro link startup procedure */


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